CONVENTIONS FOR DRAWING NETWORKS :
(a) Networks proceeds from left to right.
(b) Networks are not drawn to scale i.e. the length of the arrow does not represent time elapsed.
(c) Arrows need not be drawn in the horizontal plane but unless it is totally unavoidable they should proceed from left to right.
(d) If they are not already numbered, events or nodes should be progressively numbered from left to right. Simple networks may have events numbered in simple numeric progression i.e. 0, 1, 2, 3 etc. but larger, more realistic networks may be numbered in fives i.e. 0, 5, 10, 15 etc. or ‘tens’ i.e. 0, 10, 20, 30 etc.
This enables additional activities to be inserted subsequently without affecting the numbering sequence of the whole project.
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